Well, honey, if we're talking about military time, that's a total of 7.5 hours between 8:30 and 4:00. But if we're going the traditional route, that's 7 hours and 30 minutes. Either way, it's a chunk of time you won't get back, so make the most of it!
7 hours
Three hours
3 hours.
6 hours.
7.5 hours
8.5 hours
8 hours 15mins.
7.5 hours
Four
1360
3½
4